Preparation of 1-aminoalkylphosphonic acids and 2-aminoalkylphosphonic acids by reductive amination of oxoalkylphosphonates
作者:Artur Ryglowski、Pawel Kafarski
DOI:10.1016/0040-4020(96)00590-x
日期:1996.8
By reacting dialkyl 1-oxo- or 2-oxoalkylphosphonates with benzhydrylamine followed by reduction with triacetoxyborohydride and acid hydrolysis gave corresponding aminoalkylphosphonic acids with satisfactory yields. The use of benzylamine, α-methylbenzylamine and tritylamine was unsuccessful in the case of dialkyl 1-oxoalkylphosphonates whereas conversion of 2-oxoalkylphosphonates was also achieved
A new, practical, synthesis of β-ketophosphonates relying on the conversion of the organolithium reagentfrom a dialkyl methylphosphonate into the correspondingorganocopperreagent, and its reaction with acylchlorides is described. The structure of the intermediate organocopperreagents is discussed.
Phosphor- und schwefelsubstituierte allene in der synthese I: einfache synthese von β-ketophosphonaten aus 1-alkin-3-olen
作者:Hans-Josef Altenbach、Rainer Korff
DOI:10.1016/s0040-4039(01)92451-7
日期:1981.1
Allenic phosphonates, readily accessible from 1-alkin-3-ols, the addition products of 1-alkines to aldehydes or ketones, can be transformed to β-ketophosphonates by nucleophilic addition of diethylamine and subsequent hydrolysis of the formed enamines.
作者:Jong Eoun Hong、Chi-Wan Lee、Youngcheol Kwon、Dong Young Oh
DOI:10.1080/00397919608003523
日期:1996.4
Abstract 1-Alkynylphosphonates 4 are prepared by the in situ β-elimination of enol phosphates 3, which are readily generated by the reaction of sodium enolate of 2-oxophosphonate with diethyl chlorophosphate.
The silver‐catalyzed oxidative C(sp3)−H/P−H cross‐coupling of 1,3‐dicarbonyl compounds with H‐phosphonates, followed by a chemo‐ and regioselective C(sp3)−C(CO) bond‐cleavage step, provided heavily functionalized β‐ketophosphonates. This novel method based on a readily available reaction system exhibits wide scope, high functional‐group tolerance, and exclusive selectivity.